Liquid crystal light valve showing an improved display contrast

Details Liquid crystal light valve showing an improved display contrast Liquid crystal light valve showing an improved display contrast

1990-01-19

1991-09-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250229, 359 72, 359 59, G02F 113, G01D 534

Patent

active

050515705

ABSTRACT:
An optically-addressed liquid crystal light valve comprises a transparent insulating substrate having either one-dimensional or two-dimensional arrays of optical switching elements thereon which can perform switching with an incident light, another opposing transparent substrate having transparent electrodes and a liquid crystal sandwiched therebetween. Each of the light switching elements comprises a photo-detector circuit and a thin-film-transistor (TFT) drive circuit. The photo-detector circuit comprises a serially connected photodiode and a passive element such as capacitor or resistor. The TFT drive circuit receives as input the voltage produced from the photo-detector circuit, while the output voltage from the TFT drive circuit is applied to one pixel electrode for the liquid crystal.

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"Application of the Liquid Crystal Light Valve to Real-Time Optical Processing", W. P. Bleha et al., Optical Engineering, Jul.-Aug. 78/vol. 17, No. 4.

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